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Finding the Fourth Proportional to 856.83, 1,181.20 and 691.05

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Solution

The fourth proportional to 856.83, 1,181.20 and 691.05 is: 952.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.83 : 1,181.20 = 691.05 : x
  2. Step 2: Convert to fraction form
    856.83/1,181.20 = 691.05/x
  3. Step 3: Cross multiply
    856.83x = 1,181.20 × 691.05
  4. Step 4: Simplify right side
    856.83x = 816,268.26
  5. Step 5: Solve for x
    x = 816,268.26/856.83
  6. Step 6: Final answer
    x = 952.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.